There are 3 US Post Offices in Pope County serving a total of 3,865 residents equating to 1,288 residents per post office. It's estimated that approximately 6,169 packages are handled across the 3 county post offices annually. Pope County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 4,470, making it the second-least populous county in Illinois. Its county seat is Golconda. The county was organized in 1816 from portions of Gallatin and Johnson counties and named after Nathaniel Pope, a Secretary of the Illinois Territory."